CN106935947A - The tunneling effect and its method of work of artificial surface plasmon - Google Patents
The tunneling effect and its method of work of artificial surface plasmon Download PDFInfo
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- CN106935947A CN106935947A CN201710234942.XA CN201710234942A CN106935947A CN 106935947 A CN106935947 A CN 106935947A CN 201710234942 A CN201710234942 A CN 201710234942A CN 106935947 A CN106935947 A CN 106935947A
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- waveguide
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
- H01P5/082—Transitions between hollow waveguides of different shape, e.g. between a rectangular and a circular waveguide
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Abstract
The invention discloses the tunneling effect and its method of work of a kind of artificial surface plasmon, including：Rectangular waveguide, transition waceguide, the plasma waveguide for supporting artificial surface plasmons, and the tunnelling passage of the material of zero effective dielectric constant is filled up, wherein, rectangular waveguide, transition waceguide and plasma waveguide are sequentially connected, and are symmetrical arranged along tunnelling passage respectively；Wherein rectangular waveguide metal upper wall is scratched by part and removed, and bonding jumper is arranged in the stingy partial periodicity for removing, and forms transition waceguide and plasma waveguide.The artificial surface plasmon that plasma waveguide is motivated can be extruded into passage, and tunnelling is gone over from passage.The tunnelling effect of structure of the present invention is not influenceed by the geometry of passage, therefore can further be improved artificial surface plasmon transmission range and arbitrarily be changed the transmission direction of artificial surface plasmon.
Description
Technical field
The invention belongs to guided wave structure technical field, refer specifically to for a kind of labor statement for being based on zero effective dielectric constant material
The tunneling effect and method of work of face plasmon.
Background technology
Surface plasmons (Surface Plasmon Polaritons, abbreviation SPPs) is metal surface free electron
Intercouple a kind of non-radiating electromagnetic pattern to be formed with incident photon, and it is one kind that local is propagated in metal and medium interface
Electromagnetic wave.Metal surface free electron is in the excitation next part body coherent oscillation of incident field, and the electromagnetic field of incident light and surface are electric
The Resonant Interaction of lotus generates SPPs and assigns the property of its uniqueness.The dimension that SPPs can control optics drops from three-dimensional
It is two dimension, realizes the Effective Regulation of the super diffraction limit optical transport of nanoscale, while electromagnetic energy can be realized on nanoscale
Local converge amplify.
In order to realize the SPPs phenomenons of optical band in low-frequency range (microwave or terahertz wave band) and utilize its superior function reality
The plasma Meta Materials device of existing low-frequency range, 2004, Pendry et al. proposed a kind of metal artificial surface and labor statement first
The novel concept of face plasmon (Spoof Surface Plasmon Polaritons, abbreviation SSPPs).In microwave or too
Hertz wave band, metal is assumed to perfact conductor, and smooth metal surface is can not to transmit SPPs completely, however, in metal
After the hole of surface etch periodic distribution (size and depth of hole are in sub-wavelength state), its surface can not only pass
Similar optical band SPPs phenomenons are broadcast, the sub-wavelength constraint of field can also be realized, strengthen the osmosis of electromagnetic wave, so that equally
The plasma frequency of metal surface is reduced, and the equivalent plasma frequency on periodic structure top layer can be by changing the cycle
Property structure geometric parameter come any regulation and control, the key problem that low-frequency range SPPs cannot be produced is solved first.2005,
Hibbins et al. confirms SSPPs phenomenons in microwave section experiment, is artificial surface plasmons technology in the wide of low-frequency range
General application provide may, also excite whole world scholar to the highest attention of the important application prospect of SSPPs and widely studied.
Tunneling effect is generally present in optical band, and in the passage for filling up zero dielectric constant material, electromagnetism wave energy is extruded
Stand in channel, and in passage electromagnetic wave wavelength endless, therefore remote high efficiency of transmission can be realized.2006 are so far,
Engheta et al. proposes that the concept of Meta Materials or effective medium can be utilized so that some material effective dielectric constants are approached
Zero, realize the tunneling effect of microwave section electromagnetic wave.For the loss high that long-distance transmissions and the bend transmission for solving SSPPs face
Problem, SSPPs can be combined with tunnelling, realize the tunnelling of SSPPs.
The content of the invention
Above-mentioned the deficiencies in the prior art are directed to, it is an object of the invention to provide a kind of artificial surface plasmon
Tunneling effect and its method of work, to solve artificial surface plasmon long-distance transmissions in the prior art and bend transmission face
The loss problem high faced, the present invention is lost in can significantly reducing artificial surface plasmon transmitting procedure, realizes labor statement
Long-distance transmissions and the bend transmission of face plasmon.
To reach above-mentioned purpose, a kind of tunneling effect of artificial surface plasmon of the invention, including：Square wave
Lead, transition waceguide, the plasma waveguide of supporting artificial surface plasmons, and centre fills up the material of zero effective dielectric constant
The tunnelling passage of material, wherein, rectangular waveguide, transition waceguide and plasma waveguide are sequentially connected, and respectively along tunnelling passage pair
Claim to set；And
The metal upper wall of rectangular waveguide is scratched by part and removed, and is scratched the part removed periodic arrangement in the z-direction in metal upper wall
Bonding jumper, forms transition waceguide and plasma waveguide.
Preferably, filling dielectric constant is ε in described rectangular waveguiderMedium, the rectangular waveguide conduct of either end
The input of guided wave signals, the rectangular waveguide of the other end is used as output end.
Preferably, the strip width on described transition waceguide varies continuously to w by 0.
Preferably, the strip width on described plasma waveguide is w.
Preferably, with length it is respectively l4, width be wcInverted U, H types, U-shaped tunnelling passage connection plasma waveguide, square
Dielectric constant is filled with shape waveguide, transition waceguide and plasma waveguide for εr1Medium, tunnelling passage is filled with relative dielectric
Constant is εr2Medium, its effective dielectric constant is zero, and at the interface of two media in periodic arrangement bonding jumper.
A kind of method of work of the tunneling effect of artificial surface plasmon, including step is as follows：
TE in rectangular waveguide10Patten transformation is into artificial surface plasmons, in the presence of tunnelling passage, generation
Artificial surface plasmon is tunneling to the other end from tunnelling passage end, and in the presence of symmetrical plasma waveguide, then
It is converted into the transmission of artificial surface plasmon；The effect of tunnelling is not influenceed by shape, in 90 degree of tunnelling passages of bending
Inside efficiently transmitted.
Beneficial effects of the present invention：
1. artificial surface plasma waveguide of the invention, can support the efficient of artificial surface plasmons in broadband
Transmission.
2. the present invention has size small, is advantageously integrated, and the characteristics of being widely used, plasma waveguide passes through periodic hole
Seam, realizes TE10Pattern can be widely used in substrate integration wave-guide, circular waveguide to the conversion of artificial surface plasmon,
Elliptical waveguide.
3. the tunneling effect of the artificial surface plasmon of proposition of the invention, not only supports artificial surface plasma
The transmission of excimer, while the tunnelling of artificial surface plasmons can also be supported, solves artificial surface plasmon remote
The problem of loss high under Distance Transmission and bend transmission, for the guided wave structure design of microwave section provides a new thinking.
4. the present invention can be when the lateral dimension of tunnelling passage be fixed, by the dielectric for changing the medium in tunnelling passage
Constant adjusts the frequency of artificial surface plasmon tunnelling；In the physical dimension and the dielectric of tunnelling passage of rectangular waveguide
When constant is fixed, the frequency of tunnelling is not influenceed by the length and geometry of passage, can be realized in people under same frequency
The bend transmission of work surface plasmons.
Brief description of the drawings
Fig. 1 is the block mold structural representation of plasma waveguide of the present invention.
Fig. 2 is the A portions top perspective view of Fig. 1.
Fig. 3 is the schematic diagram of plasma waveguide construction unit.
Fig. 4 a are influence curve figure of the w changes to its dispersion characteristics in Fig. 2.
Fig. 4 b are influence curve figure of the p changes to its dispersion characteristics in Fig. 2.
Fig. 4 c are influence curve figure of the b changes to its dispersion characteristics in Fig. 2.
Fig. 4 d be Fig. 2 in d/p change to its dispersion characteristics influence curve figure.
Fig. 5 is the S parameter design sketch of plasma waveguide.
Fig. 6 a are the plasma waveguide cross sectional side view for connecting inverted U tunnelling passage.
Fig. 6 b are the plasma waveguide cross sectional side view for connecting H type tunnelling passages.
Fig. 6 c are the plasma waveguide cross sectional side view for connecting U-shaped tunnelling passage.
Fig. 7 is the S parameter design sketch of the plasma waveguide for connecting tunnelling passage.
Fig. 8 is to connect 90 degree of plasma waveguide cross sectional side views of the tunnelling passage of bending.
Fig. 9 is to connect 90 degree of S parameter design sketch of the plasma waveguide of the tunnelling passage of bending.
Specific embodiment
For the ease of the understanding of those skilled in the art, the present invention is made further with reference to embodiment and accompanying drawing
It is bright, the content that implementation method is referred to not limitation of the invention.
A kind of tunneling effect of artificial surface plasmon of the invention, including：Rectangular waveguide, transition waceguide, support
The tunnelling passage of the material of zero effective dielectric constant is filled up in the plasma waveguide of artificial surface plasmon, and centre, its
In, rectangular waveguide, transition waceguide and plasma waveguide are sequentially connected, and are symmetrical arranged along tunnelling passage respectively；And
The metal upper wall of rectangular waveguide is scratched by part and removed, and is scratched the part removed periodic arrangement in the z-direction in metal upper wall
Bonding jumper, forms transition waceguide and plasma waveguide.
Wherein, filling dielectric constant is ε in described rectangular waveguiderMedium, the rectangular waveguide of either end is used as leading
The input of ripple signal, the rectangular waveguide of the other end is used as output end.
Wherein, the strip width on described transition waceguide varies continuously to w by 0.
Wherein, the strip width on described plasma waveguide is w.
Wherein, with length it is respectively l4, width be wcInverted U, H types, U-shaped tunnelling passage connection plasma waveguide, rectangle
Dielectric constant is filled with waveguide, transition waceguide, plasma waveguide for εr1Medium, tunnelling passage is filled with relative dielectric constant
It is εr2Medium, its effective dielectric constant is zero, and at the interface of two media in periodic arrangement bonding jumper.Cause
This, the artificial surface plasmon that plasma waveguide is motivated is gone over from tunnelling in tunnelling passage, and in the work of symmetrical structure
Artificial surface plasmon is again converted under.
Embodiment one
Original plasma waveguide to supporting artificial surface plasmons tunnelling is analyzed, and the plasma waveguide is as schemed
1st, Fig. 2, port sizes are a*b=22.86*10.16mm2, it is mainly made up of three parts, is respectively the rectangular waveguide at two ends
(region I), transition waceguide waveguide (region II), and plasma waveguide (region III).The length of rectangular waveguide is l1=a, transition
Waveguide length is l2=2a, plasma waveguide length is l3=3a.The construction unit of plasma waveguide such as Fig. 3, the gold of rectangular waveguide
Category upper wall is scratched to be removed, and is connected by a bonding jumper, and its physical dimension is mainly determined by several parameters, is respectively cross section
The width d of size a and b, the width w of seam, period p, and bonding jumper.As shown in Fig. 4 a, Fig. 4 b, Fig. 4 c, Fig. 4 d, change different
Parameter has carried out dispersion emulation to construction unit, as a result shows the width w of the mainly seam for determining the asymptotic frequency of dispersion, and cycle
The change of the width d of p, thickness b and bonding jumper has little to no effect to dispersion.Influence according to seam width w to dispersion, designed
Structure is crossed, strip width varies continuously to 7a/9 from 0, realize the wave number that rectangular waveguide is transformed between plasma waveguide
Match somebody with somebody, so that TE10Pattern is efficiently transformed into artificial surface plasmon.Here b is fixed as 10.16mm, period p is solid
Be set to a/20, the width d of metal bar is fixed as a/100, Fig. 5 be the grade that is calculated by electromagnetic simulation software under above-mentioned parameter from
Transmission coefficient and reflectance factor that wavelet is led, its cut-off frequency match with the dispersion relation of construction unit under this parameter.
Between 3.32GHz to 5.24GHz, S11Respectively less than -15dB's, demonstrate TE10Artificial surface plasma can be efficiently transformed into
Excimer, and support artificial surface plasmons high efficiency of transmission in broadband.
Embodiment two
As shown in Fig. 6 a- Fig. 6 c, the tunnelling passage that will be filled with zero effective dielectric constant material is connected with plasma waveguide, right
Inverted U passage, H types passage, U-shaped passage are analyzed, and model 1 (Model1), model 2 (Model2), model 3 are corresponded to respectively
(Model3), the length of tunnelling passage is l4=4a, width are wc=a/4, the medium of filling is ε in plasma waveguide hereinr1
=4, filling relative dielectric constant is ε in tunnelling passager2=2.4 medium, and the periodic arrangement at the interface of two media
Bonding jumper.According to formulaThe frequency about 4.24GHz for producing tunneling effect can be calculated.Using electromagnetism
Simulation software can draw the transmission coefficient (S such as Fig. 721) and reflectance factor (S11), curve 1- curves 3 correspond to model respectively in figure
1- models 3.Two transmision peaks are occurred in that in three transmission coefficient curves, and first transmision peak is appeared at
4.24GHz, with agreement with theoretical calculation.It is unrelated with tunneling effect in order to verify second transmision peak, by tunnelling passage in model 1
Length l44a is increased to, the curve 4 in its transmission coefficient curve and reflection coefficient curve corresponding diagram 7, it is evident that second biography
Defeated peak value is offset to low-frequency range, it was demonstrated that caused by the transmision peak is Fabry-Perot effects, with tunneling effect without
Close.
Embodiment three
In order to the tunneling effect for further verifying artificial surface plasmons is not influenceed by channel geometries, such as scheme
Shown in 8, tunnelling passage total length l is kept4It is consistent with model 3,90 degree have been carried out to the inverted U tunnelling passage in embodiment two
Bending, filling remains the medium that relative dielectric constant is 2.4 in tunnelling passage herein, the transmission coefficient curve of the model and anti-
Coefficient curve is penetrated as shown in figure 9, occurring in that two transmision peaks, first transmision peak is still in 4.24GHz, with embodiment two
The result of first three model be consistent, it was demonstrated that artificial surface plasmon can carry out bend tunnelling.
A kind of method of work of the tunneling effect of artificial surface plasmon, including step is as follows：
TE in rectangular waveguide10Patten transformation is into artificial surface plasmons, in the presence of tunnelling passage, generation
Artificial surface plasmon is tunneling to the other end from tunnelling passage end, and in the presence of symmetrical plasma waveguide, then
It is converted into the transmission of artificial surface plasmon；The effect of tunnelling is not influenceed by shape, in 90 degree of tunnelling passages of bending
Inside efficiently transmitted.
Concrete application approach of the present invention is a lot, and the above is only the preferred embodiment of the present invention, it is noted that for
For those skilled in the art, under the premise without departing from the principles of the invention, some improvement can also be made, this
A little improvement also should be regarded as protection scope of the present invention.
Claims (6)
1. a kind of tunneling effect of artificial surface plasmon, it is characterised in that including：Rectangular waveguide, transition waceguide, support
The tunnelling passage of the material of zero effective dielectric constant is filled up in the plasma waveguide of artificial surface plasmon, and centre, its
In, rectangular waveguide, transition waceguide and plasma waveguide are sequentially connected, and are symmetrical arranged along tunnelling passage respectively；And
The metal upper wall of rectangular waveguide is scratched after removing by part, and by the stingy part removed, periodic arrangement is golden in the z-direction in metal upper wall
Category bar, forms transition waceguide and plasma waveguide.
2. the tunneling effect of artificial surface plasmon according to claim 1, it is characterised in that described square wave
It is ε to lead interior filling dielectric constantrMedium, the rectangular waveguide of either end as guided wave signals input, the square of the other end
Shape waveguide is used as output end.
3. the tunneling effect of artificial surface plasmon according to claim 1, it is characterised in that described little bellow
The strip width led varies continuously to w by 0.
4. the tunneling effect of artificial surface plasmon according to claim 1, it is characterised in that described plasma
Strip width in waveguide is w.
5. the tunneling effect of artificial surface plasmon according to claim 1, it is characterised in that rectangular waveguide length
It is l1, transition waceguide length is l2, plasma waveguide length is l3, it is respectively l with length on this basis4, width be wcFall
U-shaped, H types, U-shaped tunnelling passage connection plasma waveguide, are filled with dielectric normal in rectangular waveguide, transition waceguide and plasma waveguide
Number is εr1Medium, tunnelling passage is filled with relative dielectric constant for εr2Medium, its effective dielectric constant is zero, and
Periodic arrangement bonding jumper at the interface of two media.
6. a kind of method of work of the tunneling effect of artificial surface plasmon, it is characterised in that as follows including step：
TE in rectangular waveguide10Patten transformation into artificial surface plasmons, in the presence of tunnelling passage, generation it is artificial
Surface plasmons is tunneling to the other end from tunnelling passage end, and in the presence of symmetrical plasma waveguide, reconvert
Into the transmission of artificial surface plasmons；The effect of tunnelling is not influenceed by shape, is entered in 90 degree of tunnelling passages of bending
The efficient transmission of row.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108631028A (en) * | 2018-03-22 | 2018-10-09 | 南京航空航天大学 | Broadband band-pass filter based on Equivalent Surface plasmon and its working method |
| CN112216941A (en) * | 2020-09-30 | 2021-01-12 | 东南大学 | Tensile reconfigurable artificial surface plasmon transmission line |
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| CN108631028A (en) * | 2018-03-22 | 2018-10-09 | 南京航空航天大学 | Broadband band-pass filter based on Equivalent Surface plasmon and its working method |
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| CN112216941A (en) * | 2020-09-30 | 2021-01-12 | 东南大学 | Tensile reconfigurable artificial surface plasmon transmission line |
| CN112216941B (en) * | 2020-09-30 | 2021-12-14 | 东南大学 | Tensile reconfigurable artificial surface plasmon transmission line |
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Application publication date: 20170707 |